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I am trying to use Jackson via Kotlin to deserialize xml provided by the lastfm api. I had this working in Java with JAXB, and am trying to port it. Everything works with the exception of unwrapped list fields - Track in the below example. I know that Track data class is working, because if I use val track: Track? = null instead of val track: List? = null I do get a valid single Track object.

The error I get is com.fasterxml.jackson.databind.exc.MismatchedInputException: Cannot construct instance ofinfo.eidson.lastfm.Track(although at least one Creator exists): no String-argument constructor/factory method to deserialize from String value ('Flash \Flash Gordon's Theme\""') at [Source: (ByteArrayInputStream); line: 1, column: 205] (through reference chain: info.eidson.lastfm.RecentTracks["track"]->java.util.ArrayList[1]) and I believe it is trying to use the List class as the POJO instead of Track.

I've tried using a regular class instead of a data class with the same result. According to https://www.baeldung.com/jackson-xml-serialization-and-deserialization all that is necessary is to add the @JacksonXmlElementWrapper(useWrapping = false) annotation. I've tried with and without the @JacksoXmlProperty annotation and I've tried setting the useWrapping on the mapper.

What should I try next?